A Survey of Power Plant Designs
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1 A Survey of Power Plant Designs Elizabeth K. Ervin (with many thanks to internet and text sources) index.html The General James M Gavin Steam Power Plant near Cheshire, Ohio full capacity: 2,600,000kW Israel Urieli (Dr. Iz), Associate Professor, Mechanical Engineering, Ohio University
2 Combustion Turbine Power Plant Open System The turbine burns either natural gas or oil. Fuel is mixed with compressed air in the combustion chamber and burned. High-pressure combustion gases spin the turbine, which drives the generator. Source: Tennessee Valley Authority (TVA),
3 Sustainable Energy, MIT 2005.
4 Allen Fossil Plant is on the Mississippi River five miles southwest of downtown Memphis. Paradise Fossil Plant is located in western Kentucky on the Green River near the village of Paradise. The plant has three units, completed between 1963 and 1970, and three large natural-draft cooling towers to provide cooling water. Producing 2,273 MW, the plant consumes some 20,000 tons of coal a day. The Southaven Combined-Cycle Combustion Turbine Plant is located near Desoto County, Mississippi. Running on natural gas, plant capacity is 810 MW.
5 Coal-fired Power Plant Coal burned in the boiler heats water to produce steam. The steam spins the turbine, which drives the generator. Source: Tennessee Valley Authority (TVA),
6 Coal fired Plant Otpco.com Fuel handling (1) Rotary dumper (2) Storage building (3) Alternate fuel-handling facility (4) Transfer house Furnace (5) Silos (6) Cyclone furnaces (7) Boiler furnace (8) Forced-draft fans Electric generation (9) Turbine (10) Generator Electric transmission (11) Transformer (12) Substation Environmental equipment (13) Fans (14) Precipitator (15) Ash silo (16) Stack (17) Emission monitors Water handling (18) Cooling pond (19) Condenser (20) Brine concentrator
7 Kemper Combustion Turbine Plant is located in Kemper County, Mississippi, near the city of DeKalb. With four combustion turbine generating units, plant capacity is 340 MW. Note the cooling towers. ---TVA
8 Fuel Cells Input: H and O Output: Water
9
10 Geothermal Power Plant
11 Geothermal Plant operation
12 Iceland Inhabitat.com
13 Hydroelectric Power Plant Water from the reservoir rushes through the penstock into the powerhouse. The water spins the turbine, which drives the generator. Inside the generator is a large electromagnet that spins within a coil of wire, producing electricity. Source: Tennessee Valley Authority (TVA),
14 Watts Bar Dam Construction feet high and stretches 2,960 feet across the Tennessee River. Tva.gov Official name Hoover Dam Impounds Colorado River Creates Lake Mead Locale Nevada-Arizona US Length 1244 ft (379 m) Height ft (221 m) Construction
15 Wind Turbine Electric Generator Source: TVA,
16
17 Biomass
18 Methane Gas Power Plant Pipes collect methane gas produced by decaying waste, and the gas is burned to generate electricity. Source: Tennessee Valley Authority (TVA),
19 A general view of the 50- megawatt landfill gas power plant, newly built and claimed by South Korea to be the world's largest one, at a mammoth garbage dumping site in Incheon, west of Seoul, 11 December The Plant uses only methane gas, naturally generated from the site, to produce electricity for more than 180,000 households.
20 Solar Power Plant Photovoltaic (PV) systems use semiconductor cells that convert sunlight directly into electricity. Direct current from the PV cells, which are arrayed in flat panels, flows to inverters that change it to alternating current. Source: Tennessee Valley Authority (TVA),
21 Concentration of sunlight using (a) parabolic trough collector (b) linear Fresnel collector (c) central receiver system with dish collector and (d) central receiver system with distributed reflectors mentals2/index_e.html
22 Operational in 2011 in Arizona.
23 Solar Thermal Power Plant Schematic of a concentrated solar thermal trough power plant with thermal storage
24 Nuclear Power
25 Fission Power Generation I: 1950s-1970s Generation II: 1970s-1980s Currently in use today; LWR (BWR, PWR), CANDU HWR Generation III (Not in U.S.) Advanced evolutionary design; ABWR, APWR, passive reactor Generation III+ : By 2010 Pebble bed reactor, larger passive reactors Generation IV: conceptual, by 2030? Economic Safe Minimal waste Publically acceptable
26 Summary of Power Reactor Types Reactor Type Coolant Moderator Current Deployment Pressurized water reactors (PWR, VVER) Boiling water reactors (BWR) Pressurized heavy water reactor (PHWR) Gas-cooled reactors (Magnox, AGR, UNGG) Liquid Metal-cooled (LMFBR) Light water graphite reactors (RBMK) Light water Light water Most countries, 259 Light water Heavy water CO 2, Helium Sodium, lead, Bismuth Pressurized boiling water Light water Heavy water Graphite None Graphite Steam generated in secondary loop Steam from boiling water fed to turbine Most countries, 92 Argentina, Canada, China, India, Korea, Pakistan, Romania, 43 UK, Russia, 32 France, Japan, Russia, India, 2 Former USSR, 13 Sustainable Energy, MIT 2005; Britannica.
27 Thanks to Dr. Magdi Ragheb, University of Illinois at Urbana- Champaign, Nuclear, Plasma and Radiaion Science: Inventing the Future,
28 Light Water Reactors Most common type in use 25% BWR 75% PWR Ordinary water = moderator Number of operating U.S. reactors: 104 (35 boiling water reactors, 69 pressurized water reactors) 14 BWR plants have one reactor; nine have two reactors; one has three reactors 15 PWR plants have one reactor; 24 have two reactors; two have three reactors
29 Light Water Reactor 1000MW LWR Fuel Cycle with Reprocessing Sustainable Energy, MIT 2005.
30 Nuclear Boiling Water Power Plant Closed System Water is heated through the controlled splitting of uranium atoms in the reactor core and turns to steam. Pumps force the water through the reactor at top speed, maximizing steam production. Steam drives the turbines that turn the generator that makes electricity. Cooling water from the river condenses the steam back into water. The river water is either discharged directly back to the river or cooled in the cooling towers and reused in the plant. Source: Tennessee Valley Authority (TVA),
31 BWR NRC Wikipedia
32 1040 psia No pressurizer or steam generator Usually control rods from bottom Sustainable Energy, MIT 2005.
33 Operational Characteristics of a typical BWR
34 ABWR, GE.
35 BWR Flow Diagram
36 BWR Engineered Safety Features Stability: tolerates mechanical malfunctions and human errors Controls are redundant and automated
37 Nuclear Pressurized Water Power Plant Britannica Source: TVA
38 PWR NRC Wikipedia
39 PWR Sustainable Energy, MIT 2005.
40 PWR 2200 psia/150 bars No boiling Efficiency = 32% Low capital cost
41 Operational Characteristics of a Typical PWR
42
43
44 PWR Engineered Safety Features
45 Heavy Water Reactor 2 nd most popular type of reactor in use CANDU Online refueling Use natural uranium without enrichment, but needs heavy water D 2 O production Less spent fuel storage
46 CANDU Pressurized Heavy Water Reactor Nukeworker.com
47 CANDU Gas-Cooled Reactor Sustainable Energy, MIT 2005.
48
49 Next Generations Generation III and III+ ABWR - Advanced Boiling Water Reactor System 80+ APWR - Advanced Pressurized Water Reactor Passive reactor design Generation IV GFR Gas-Cooled Fast Reactor System LFR Lead-Cooled Fast Reactor System MSR Molten Salt Reactor System SFR Sodium-Cooled Fast Reactor System SCWR Supercritical-Water-Cooled Reactor System VHTR Very-High-Temperature Reactor System
50 High Temperature Gas-Cooled Reactor Japan and China; >900 deg C Nukeworker.com
51 HGTR
52 High Temperature Gas-Cooled Reactor Nukeworker.com
53 Passive Reactors Passively safe reactors rely on nature to keep them cool Cooling with a sodium pool The pool design passively removes decay heat if normal heat-removal systems fail. Sodium Highly efficient heat-transfer material Operates at normal atmospheric pressure Increases reliability of components because it does not corrode common structural materials Tends to bind chemically with radioactive fission products, which reduces radioactive releases if fuel fails. Metallic Fuel: an alloy of uranium and other metals. The safety bottom line: natural feedback mechanisms tend to maintain coolant temperature near its normal 500 degrees C (930 degrees F) operating value well below sodium's 900 C (1,650 F) boiling point even when the reactor loses its engineered cooling systems. Argonne National Lab
54 Diagram of major components in an advanced fast reactor. (passive reactor) Argonne National Lab, ANL
55 Passive Reactor Designs AP600 and AP1000
56 Pebble Bed Reactor Spherical pellets, Brayton cycle 110 MW output
57 Pebble Bed Reactor South Africa as leaders Helium (500 deg C, 9MPa) cooled 450,000 fuel spheres Helium is now 900 deg C Schema-root.org
58 Pebble Bed Reactor NRC
59
60
61
62 Molten Salt Advanced High Temperature Reactor Low pressure molten salt cooled (vs. high pressure helium) MW or MW Fuel: Uranium/Plutonium/minoractinide/zirconium 550 deg C outlet temp
63 Molten Salt Advanced High Temperature Reactor
64 Breeder Reactors a nuclear reactor that generates new fissile material at a greater rate than it consumes such material French Phénix: for 100 fission reactions there are 115 newly produced fissile nuclei Two types of traditional breeder reactor have been proposed: fast breeder reactor: plutonium, natural (or even depleted) uranium thermal breeder reactor: thorium-232 uranium-233 The heat of primary sodium is transferred to the secondary sodium in an intermediate heat exchanger, while the third heat exchanger is the steam generator. Three loops are needed for safety (liquid sodium is very dangerous: the primary sodium is highly radioactive because of neutrons activation, which results in Na-24; the second sodium loop prevents radioactive sodium from accidental contact with water.)
65 1 Fuel (fissile material) 9 Cover 17 Condenser 2 Fuel (breeder material) 10 Na/Na heat exchanger 18 Cooling water 3 Control rods 11 Secondary Na 19 Cooling water pump 4 Primary Na pump 12 Secondary Na pump 20 High pressure turbine 5 Primary Na coolant 13 Steam generator 21 Low pressure turbine 6 Reactor vessel 14 Fresh steam 22 Generator 7 Protective vessel 15 Feedwater pre-heater 23 Reactor building 8 Reactor cover 16 Feedwater pump
66 Nuclear Fusion Power Done by 2018? Graduating Engineer magazine, Back-to-School 2008.
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